fiddlejo, from the Core 2 Quad and Duo Temperature Guide:
http://www.tomshardware.com/forum/221745-29-core-quad-temperature-guide
Section 5: Findings
(
A) Depending upon Stepping, the Delta between
Tcase and
Tjunction is
10c +/-
3 (or)
15c +/-
3.
(
B)
Tcase is acquired on the CPU Die from the CPU Case Thermal Diode as an analog level, which is converted to a digital value by the super I/O chip on the motherboard. The digital value is
Calibrated in BIOS and displayed by temperature software.
(
C)
Tjunction is acquired within the Cores from Thermal Diodes as analog levels which are converted to digital values by the
Digital
Thermal
Sensors (
DTS) within each Core. The digital values are factory
Calibrated and displayed by temperature software.
(
D)
Tcase and
Tjunction are both acquired from Thermal Diodes, however, analog to digital (A to D) conversions are executed by different devices in separate locations. BIOS
Calibrations, factory DTS
Calibrations and temperature software can all be erroneous.
(
E) Core Temp, CPU-Z, Crystal CPUID and SpeedFan will be used for
Calibrating Tcase and
Tjunction at Idle. Prime95 will then be used for Load testing and SpeedFan will be used for temperature monitoring.
Section 9: Calibrations
The purpose of the following procedure is to decrease Idle power consumption and heat dissipation by manually setting BIOS to the lowest common denominators for
Vcore and frequency among C2Q / C2D variants and motherboards. The Idle Test is conducted offline with Windows programs closed,
1.25 Vcore,
1.6 Ghz, computer case covers removed, and all fans at
100%. Setting these
Variables eliminates cooling issues, and allows all CPU coolers (including Intel`s stock cooler) to decrease
Tcase to within
1c above
Ambient, which provides for accurate
Tcase Offset correction.
Tjunction is then validated by reading the
Digital
Thermal
Sensor (
DTS) registers, which provides for accurate
Tjunction Offset corrections, and establishes an accurate
Tcase to
Tjunction Delta.
fiddlejo, use the Guide and SpeedFan to Calibrate your temperatures so that you'll know they're correct.
Comp